Vent pipe joint guard



Aug. 22, 1933. E. N. LIGHTBOW'N VENT PIPE JOINT GUARD Filed June 8, 1932Patented Aug. 22, 1933 VENT PIPE JOINT GUARD Edward N. Lightbown,Brentwood, Md.

Application June 8, 1932. Serial No. 616,145

1 Claim.

This invention relates to vent pipes and has special reference to a ventpipe joint guard.

In the art of plumbing it is required, under most codes of plumbinglaws, that each plumbing 5 fixture have a trap and that each trap beconnected to a vent pipe extending through the roof of the building inwhich the fixture is located.'

In order to prevent leaks of rain water at the place where the vent pipeextends through the roof it is the practice to provide a flashing orflange having a sheet metal base which lies flat on and is secured in aleak proof manner to the roof. From this base there extends upwardly atubular portion through which the vent pipe passes. Usualy this tubularportion is made of malleable metal such as lead or soft copper and itis, after being positioned, hammered or swedged into intimate contactwith the exterior of the vent pipe. Due to various causes such asimproper'or careless workmanship in forming the joint, the vibratoryeffects of winds, expansion and contraction from changes in temperatureand the like, this joint between the vent pipe and flashing or flange isapt'to open so that rain runs down the vent pipe through the open jointand leaks into the house.

The principal object of the present invention is to provide a novelattachment for vent pipes joint with the flashing against allpossibility of leaking, the device being of such'nature as to be veryinexpensive and readily applicable to vent pipes either alreadyinstalled or during installation.

With the above and other objects in view, as will be presentlyunderstood, the invention consists in general of certain novel detailsof construction hereinafter fully explained, illustrated in theaccompanying drawing and specifically claimed.

In the accompanying drawing like characters of reference indicate likeparts in the several views, and:

Figure 1 is a side elevation showing the device as applied to a ventpipe.

Figure 2 is a vertical section through the device, the tubular portionof the flashing or flange and the upper part of the vent pipe being alsoshown in section.

Figure 3 is a section on the line 33 of Figure 2, and

Figure 4 is a section on the line 4--4 of Figure 2.

In the embodiment of the invention as here shown the roof line isindicated at 10 and on the roof is applied a flashing or flange plate 11having a centrally disposed tubular portion 12. The upper end 13 of thisportion is fitted tightly, as by hammering or swedging, against theexterior of a vent pipe 14 which extends well up above the roof forminga guard which will completely protect the through this tubular portion12. It is at this joint between the portion 13 and the vent pipe 14 thatthe leak is apt to develop.

The attachment itself consists of a metallic sleeve having a slightlytapered body 15 of suflicient length to extend from the top of the ventpipe to a point well below the upper end 13 of the tubular part of theflashing. Commonly the vent pipe extends about twelve inches above theend 13 and in such case the length of the body 15 would, preferably beabout thirteen inches. An inturned cuff 16 is formed on the upper andsmaller end of the body 15 and is spaced from the body so as to let theupper end of the vent pipe fit in the space, the cuff extending down ashort distance, say a half inch, into the vent pipe. The upper end ofthe body is preferably about three-sixteenths of an inch larger than thediameter of the vent pipe while the lower end of the body is aboutseven-eighths of an inch more in diameter than said vent pipe. As thedevice is made the shape of the lower end is that shown by dotted linesin Figure 2 but when the device is applied to a vent pipe this lower endis hammered or swedged in against the part 13 as shown in full lines at17 in said Figure 2. It is to be understood that the device is to be ofsuitable malleable metal or other suitabl material.

It will now be plain, from an inspection of th drawing, that there canbe no possibility of a leak at the joint 13.

Obviously changes may be made in the form and proportions of theinvention. For instance, the dimensions referred to may be varied tosuit conditions and are not to be understood as restricting theinvention to any particular size or proportion, the scope of theinvention being understood to be limited only by the claims.

What is claimed is:-

A joint guard for the joint between a vent pipe and the tubular portionof its flashing and consisting of a tubular body member having alengthsufiicient to extend from the top of the vent pipe to a pointbelow the joint of the pipe and its flashing, and an inturned cuffformed on the upper end of the body and adapted to extend down into thetop of the vent pipe, said body being tapered outwardly from the upperend downwardly to a point approximately on the level of the upper end ofthe flashing and having its lower end arranged to fit tightly againstthe outer surface of the tubular portion of the flashing. The lower endof the body being curvingly tapered inwardly to fit at its lower edgeflat against said tubular portion of the flashing. V

' EDWARD N. LIGHTBOWN.

